CN101806577A - Piezomagnetic turbine loss type reinforced concrete strain sensor and piezomagnetic stain meter thereof - Google Patents
Piezomagnetic turbine loss type reinforced concrete strain sensor and piezomagnetic stain meter thereof Download PDFInfo
- Publication number
- CN101806577A CN101806577A CN 201010151533 CN201010151533A CN101806577A CN 101806577 A CN101806577 A CN 101806577A CN 201010151533 CN201010151533 CN 201010151533 CN 201010151533 A CN201010151533 A CN 201010151533A CN 101806577 A CN101806577 A CN 101806577A
- Authority
- CN
- China
- Prior art keywords
- sensor
- strain
- circuit
- reinforced concrete
- whirlpool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a piezomagnetic turbine loss type reinforced concrete strain sensor, and is characterized in that a piezomagnetic turbine loss effect is used as a sensing mechanism to manufacture a piezomagnetic turbine loss type reinforced concrete strain sensor and a piezomagnetic stain meter thereof for measuring surface strain, inner strain and steel bar strain. The sensor is designed with a mechanics model and a deformation structure of a combined cantilever beam or a cantilever curved beam with two elastic free ends. The invention uses a seamless connection technology of whole manufacturing and conical hole connection and a component separation signal processing method. Compared with the prior art, the invention has the characteristics of high sensitivity, good stability, small measuring error, strong reliability, simple structure, low cost and convenient use; and the invention has wide application prospect.
Description
Technical field
The present invention relates to a kind of pressure magnetic whirlpool consumption formula reinforced concrete strain sensor and press the magnetic strain instrument, belong to the electric detecting technology field of reinforced concrete works structural strain and stress.
Background technology
It is the test item that all large-sized reinforced concrete structural strengths detect or safety assessment must be carried out that concrete and reinforcing bar strain (stress) are measured.The most general method is the resistance strain measurement method both at home and abroad at present, imbeds promptly at concrete surface subsides resistance strain gage, or with the measuring sensor that resistance strain gage is made and carries out strain measurement in the concrete, the stress of calculating structure again according to concrete elastic modulus.The greatest problem of this method is temperature, humidity, torrent ... etc. the tremendous influence of environmental factor to measurement result, particularly less stretching strain measurement causes flagrant measuring error to value.Along with development of fiber technology, make Fibre Optical Sensor in this area, more and more be studied and use in recent years.Chinese patent CN100449261C disclosed " removable embedding type optical fiber strain sensor ", CN1869582A disclosed " fibre-optical grating sensitization strain transducer method for designing and manufacture craft " are exactly one group of typical example.Though these patents all have detailed argumentation to its principle and structure.But fail to provide sensitivity and important data such as measuring accuracy and result of use, its reliability and practicality are still unknowable.The factor that influences Fibre Optical Sensor is more, and therefore sensor and checkout equipment costliness are badly in need of research and development new more reliable sensors and relevant detection equipment and detection technique.
Summary of the invention
The objective of the invention is provides a kind of pressure magnetic whirlpool to consume the formula reinforced concrete strain sensor at the deficiencies in the prior art and presses the magnetic strain instrument, be characterized in adopting and press magnetic whirlpool consumption effect to succeed in developing for sensing mechanism, be used for the pressure magnetic whirlpool consumption formula reinforced concrete strain sensor of surface strain, internal strain and reinforcing bar strain measurement and press the magnetic strain instrument, this sensor design the mechanical model and the distressed structure of two elasticity free ends combination semi-girders or cantilever curved beam; Used the signal processing method that seamless connectivity technology that whole processing is connected with taper hole and component separate.
The present inventor finds in the magnetic circuit of a ferromagnet and a hot-wire coil composition, the caused magnetoconductivity of the mechanically deform of the stressed generation of ferromagnet changes, can not only change the inductance and the impedance thereof of coil, and more can change ferromagnetic eddy current loss (whirlpool consumption) characteristic significantly.Because people have called the former " piezomagnetic effect ", institute thinks and shows difference that the inventor calls the latter " pressing magnetic whirlpool consumption effect ".Primary Study shows that the former is much higher for the latter's remolding sensitivity, almost is the former 3～5 times (know ferromagnet kind and decide).Though be limited to condition, the present invention does not also understand fully the micromechanism of pressing magnetic whirlpool consumption effect, a large amount of macroscopic view tests and analytical proof its outwardness, and will in the Non-Electricity Measurement field, open up a brand-brand-new way.
The present invention is the pressure magnetic whirlpool consumption formula strain transducer that sensing mechanism develops to press magnetic whirlpool consumption effect, with existing be that the piezomagnetic sensor of sensing mechanism is compared and not only had many more superior technical features with the piezomagnetic effect, and from being diverse in essence.The inductance that existing piezomagnetic sensor utilizes the ferromagnetic material mechanically deform to produce changes, and does not only recognize the very big benefit of pressing magnetic whirlpool consumption effect, and usually adopts measure such as cores pile in layers that the whirlpool consumption is handled as a negative factor.
Purpose of the present invention is realized by following technical measures:
Pressure magnetic whirlpool consumption formula reinforced concrete strain sensor comprises ferromagnet, makes up ferromagnet footnote, pilot hole, clamping screw and the outlet cable plug that semi-girders, ferrite coil, taper hole and cone are connected with the whole processing of ferromagnet at two elasticity free ends of one, the ferrite coil is to use adhering with epoxy resin on ferromagnetic framework, and be positioned on the center line of semi-girder fixed end, the gap between holding coil iron core and the semi-girder surface is 0.1～0.15mm.
Two elasticity free end combination semi-girders are that two one ends are fixed, and an end has the free-ended combination semi-girder of semicircle, U-shaped or S shape elasticity.
Strain transducer comprises ferromagnet, makes up cantilever curved beams, ferrite coil, termination, outlet cable plug with the whole processing of ferromagnet at two elasticity free ends of one, has ring poor aluminum alloy casing and epoxy sealing.The ferrite coil is to be bonded on the ferromagnetic framework with epoxide-resin glue, and be positioned on the straight section center line of cantilever curved beam fixed end, gap between holding coil iron core and the curved beam surface is 0.1～0.15mm, and the aluminum alloy casing and the two elasticity free end combination cantilever curved beam that have annular groove have constituted a kind of outer formula sensor construction that holds.
Two elasticity free end combination cantilever curved beams are that two one ends are fixed, and an end has the free-ended combination overarm of semicircle, U-shaped or S type elasticity curved beam.
Strain transducer comprises ferromagnet, makes up cantilever curved beams, ferrite coil, rubber seal, footing screw, aluminum alloy casing, silicone rubber seal separation layer, outlet cable plug and end cap with the whole processing of ferromagnet at two elasticity free ends of one.The ferrite coil is to be bonded on the ferromagnetic framework with epoxide-resin glue, and is positioned on the straight section center line of cantilever curved beam fixed end, and the gap between holding coil iron core and the curved beam surface is 0.1～0.15mm.
Two elasticity free end combination cantilever curved beams are that two one ends are fixed, and an end has semicircle, U-shaped or the free-ended combination cantilever of S shape elasticity curved beam.
Press the pressure magnetic strain instrument of magnetic whirlpool consumption formula reinforced concrete strain sensor to connect and compose by standard sine wave producer, preset balancing circuitry, sensor measuring circuit, amplifier circuit, coherent detector circuit, A/D converter circuit and Output Display Unit circuit successively.
In order to make sensor have excellent mechanical property and to realize pressing the magnetic whirlpool to consume the distressed structure of effect, the present invention has designed a kind of " two elasticity free end combination semi-girder " mechanical model and corresponding distressed structure, make twin beams be equal to two real semi-girders, can realize the harmony distortion and not produce any additional displacement, can provide the half-bridge complementation of differential deformation to repay mechanism again.When burying strain transducer and reinforcing bar strain transducer in the design concrete, in order to reduce physical dimension, the present invention has designed " two elasticity free end combination cantilever curved beam " again and has satisfied internal strain and the requirement of reinforcing bar strain measurement technique better.
Because during working sensor, piezomagnetic effect and pressure magnetic whirlpool consumption effect produce simultaneously, measure in the output signal of bridge circuit, have comprised the component of signal of two kinds of effects, and have concentrated on the imaginary part and the real part of output signal respectively.The present invention has adopted the measure of " component separation " that they are separated and has handled respectively for this reason, adopts the output of the pressure magnetic whirlpool consumption effect signal component of real part as sensor at last, thereby has eliminated the influence of piezomagnetic effect basically.
In order to improve the stability of system, the present invention has designed " standard sine wave producer ", the method that the staircase waveform that adopts monolithic processor controlled accurate D/A converter to produce approaches standard sine wave, the AC power that has provided a high precision, high stable is as the bridge source of measuring bridge.
The present invention has designed outer holding and has buried the strain transducer structure in the formula concrete, and its measuring point strain presses magnetic whirlpool consumption formula strain transducer to measure by interior establishing, but its stress is born by aluminum alloy casing.According to condition of compatible deformation, the strain of shell is identical with concrete strain, therefore we do not need concrete elastic modulus, only need aluminium alloy elastic modulus (constant that can in advance accurately measure) just can directly convert out concrete stress, thereby eliminated measuring error and the different differences of bringing of demarcation that modulus of elasticity of concrete brings with running status.Consider concrete heterogeneity in addition, the measurement gauge length that the present invention designs sensor is 12cm, is 2～3 times of the average aggregate size of concrete basically, and this has not only overcome the defective of aggregate skewness, and tension and compression stress all can be measured.
In order to isolate reinforcing bar and concrete distortion and the mechanical damage of protection sensor when not being subjected to concrete depositing effectively, when design reinforcing bar strain transducer, aluminum alloy casing and silicon rubber separation layer have been adopted.Because the silicon rubber material is fine and closely woven, elastic modulus is low, elastic deformation is big, almost completely can retrain powerful reinforcing bar distortion, thereby reach the purpose of effective isolation.Consider the unevenness of concrete and reinforcing bar section and the influence of fabricated section, the measurement gauge length that we set the reinforcing bar strain transducer is 10cm.
Performance test:
1, linear measurement range: displacement 0.00005～0.1mm
Strain 0.4～1000 μ ε
2, measuring error: be no more than 2%
3, sensor sensitivity coefficient: gauge length 10cm 12cm 14cm
Sensitivity coefficient 96 116 135
4, strainmeter sensitivity coefficient: 50,100,150,200
5, resolution: displacement 0.00005mm
6, stability: 8 hours zero point drift → 0
Above performance can be done suitably to adjust according to different measurement requirement, can significantly expand linear measurement range such as suitable desensitization.
The present invention has following advantage:
1, sensor of the present invention has high sensitivity.Its sensitivity coefficient almost is 70 times of resistance strain gage, is 3～5 times of pressure Magnetic Sensor.If necessary, its value can also improve exponentially.
2, the present invention has fabulous stability and reliability.Under 8 hours situation of continuous working, its zero point drift is almost " 0 ".Be particularly suitable for the long-term observation of structure.
3, eddy current loss is the impedance of pure resistance character, and the output of measuring bridge has good linearity, makes linearity of the present invention further be expanded and promote.
4, two elasticity free ends make up semi-girders (containing the cantilever curved beam) and do not have installation measures such as gap taper hole connection and positioning bonding, have guaranteed not produce in the operating sensor any additional displacement, thereby have greatly improved measuring accuracy.
5, the component separating measure is separated two kinds of components of piezomagnetic effect and pressure magnetic whirlpool consumption effect and is handled respectively, has eliminated the influence of piezomagnetic effect basically, has set up single pressure magnetic whirlpool consumption effect component and measured direct relation.
6, the AC bridge source of high precision high stability has guaranteed to press the high stability of magnetic strain instrument, and is proper as long as the sensitivity coefficient survey is selected, and its in-site measurement error generally can not surpass 5%.
7, hold outward bury strainometer in the formula concrete and record strain after, do not need modulus of elasticity of concrete just can directly convert out concrete stress.
8, the present invention is simple in structure, cheap, easy to use.Particularly the surface strain sensor still is the tool-type sensor of long-term use of loading and unloading type, all can prolonged and repeated loading and unloading reuse, reduces significantly and detect cost for every.
Description of drawings
Fig. 1 is for pressing one of magnetic whirlpool consumption formula reinforced concrete strain sensor
Fig. 2 is the vertical view of Fig. 1
1. ferromagnet, 2. pair elasticity free end combination semi-girder, 3. ferrite coil, 4. be connected ferromagnetic footnote, 5. pilot hole, 6. clamping screw, 7. outlet cable plug of taper hole and cone.
Fig. 3 is for pressing two of magnetic whirlpool consumption formula reinforced concrete strain sensor
1. ferromagnet, 2. pair elasticity free end combination cantilever curved beam, 3. ferrite coil, 4. termination (bandgap calibration and bury underground and use screw), 5. outlet cable 6. has the aluminum alloy casing of annular groove, 7. epoxy sealing
Fig. 4 buries synoptic diagram underground for two of strain transducer
1. strain transducer, 2. connecting link, 3. distributing bar, 4. pad
Fig. 5 is for pressing three of magnetic whirlpool consumption formula reinforced concrete strain sensor
1. ferromagnet, 2. pair elasticity free end combination cantilever curved beam, 3. ferrite coil, 4. rubber seal, 5. footing screw, 6. aluminium alloy guard shield, 7. silicone rubber seal separation layer, 8. outlet cable, 9. end cap
Fig. 6 is three scheme of installations of strain transducer
1. strain transducer, 2. reinforcing bar, 3. locator card, 4. set screw, 5. pad, 6. epoxy cementing layer
Fig. 7 is for pressing magnetic strain instrument elementary cell block diagram
1. standard sine wave invention device, 2. preset balancing circuitry, 3. sensor measuring circuit, 4. amplifier circuit, 5. coherent detection circuit, the 6.A/D change-over circuit, 7. output shows
Fig. 8 is for pressing magnetic strain instrument metering circuit figure
Fig. 9 is for pressing magnetic strain instrument circuit figure
Embodiment
Below by embodiment the present invention is carried out concrete description; be necessary to be pointed out that at this present embodiment only is used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment according to the content of the invention described above.
Embodiment
One of formula reinforced concrete strain sensor is consumed as shown in Figure 1 in pressure magnetic whirlpool, and this strain transducer comprises ferromagnet 1, makes up ferromagnet footnote 4, pilot hole 5, clamping screw 6 and the outlet cable plug 7 that semi-girders 2, ferrite coil 3, taper hole and cone are connected with the whole processing of ferromagnet at two elasticity free ends of one.Wherein, two elasticity free end combination semi-girders are that two one ends are fixed, and an end has the free-ended combination semi-girder of semicircle, U-shaped or S shape elasticity.During assembling, at first with ferrite coil 3 usefulness adhering with epoxy resin on ferromagnetic framework, and be positioned on the center line of semi-girder fixed end, gap between holding coil iron core and the semi-girder surface is 0.1～0.15mm, footnote, clamping screw and outlet cable and male component is loaded onto to get final product then.During measurement, the sensor footnote is bonded on the measuring point surface of handling well in advance, and is screwed in advance in the plastic expansion screw pre-buried below pilot hole sensor is temporary fixed with wood screw by pilot hole with epoxide-resin glue.After treating the epoxy glue full solidification, take out temporary fixed wood screw, take-off the brake screw, connect strainmeter and just can test.
Press magnetic whirlpool consumption formula reinforced concrete strain sensor two as shown in Figure 2, this strain transducer comprises ferromagnet 1, with the two elasticity free end combination cantilever curved beams 2 of the whole processing of ferromagnet in one, ferrite coil 3, termination 4, outlet cable plug 5, encircle poor aluminum alloy casing 6 with having, epoxy sealing 7, during assembling, ferrite coil 3 usefulness epoxide-resin glues are bonded on the ferromagnetic framework, and be positioned on the straight section center line of cantilever curved beam fixed end, gap between holding coil iron core and the curved beam surface is 0.1～0.15mm, and the aluminium that has annular groove closes shell 6 and constituted a kind of outer formula sensor construction that holds with two elasticity free end combination cantilever curved beams 2.Wherein, two elasticity free end combination cantilever curved beams are that two one ends are fixed, and an end has semicircle, U-shaped or the free-ended combination cantilever of S shape elasticity curved beam.Press at last shown in the figure, remaining part is contained in respectively on the ferromagnet, constitute a complete outer formula concrete strain sensor that holds.During measurement, shown in figure three, the screwed end of connecting link is screwed into the termination of sensor, the other end is welded near the measuring point the distributing bar, sensor support on to be measured should the changing direction of measuring point.As measure plane stress or three-dimensional stress state, can be arranged to strain rosette as method.In the overall process of structure installation and operation, all can carry out strain measurement in concrete depositing.This outer hold formula structure sensor and measure concrete strain after, do not need concrete elastic modulus, only need utilize the condition of compatible deformation of concrete and load-carrying covering just can convert out concrete stress.
Press magnetic whirlpool consumption formula reinforced concrete strain sensor three as shown in Figure 4, this strain transducer comprises ferromagnet 1, makes up cantilever curved beams 2, ferrite coil 3, rubber seal 4, footing screw 5, aluminum alloy casing 6, silicone rubber seal separation layer 7, outlet cable plug 8 and end cap 9 with the whole processing of ferromagnet at two elasticity free ends of one, wherein, two elasticity free end combination cantilever curved beams are that two one ends are fixed, and an end has semicircle, U-shaped or the free-ended combination cantilever of S shape elasticity curved beam.During assembling, ferrite coil 3 usefulness epoxide-resin glues are bonded on the ferromagnetic framework, and are positioned on the straight section center line of cantilever curved beam fixed end, the gap between holding coil iron core and the curved beam surface is 0.1～0.15mm.Then remaining part is contained on the ferromagnet, and isolates complete reinforcing bar strain transducer of formation with silicone rubber seal.The locator card that at first will in advance process according to rebar sizes to be measured during measurement is welded on the tested reinforcing bar, and as shown in Figure 5, its center distance just in time is this sensor gauge length 10cm.Then with sensor footing screw freely (unfettered) put into the big slightly hole clipping of its diameter, set screw is adjusted in indication by strainmeter, guaranteeing under the constant condition of sensor " zero point ", lock set screw and pour into epoxy glue and shut, treated 24 hours, after epoxy glue solidifies,, begin test with regard to pourable concrete.
The block diagram of pressure magnetic strain instrument this pressure magnetic strain instrument is is as shown in Figure 6 connected and composed by standard sine wave producer 1, preset balancing circuitry 2, sensor and metering circuit 3, amplifier circuit 4, coherent detector circuit 5, A/D converter circuit 6 and Output Display Unit circuit 7 successively.
Sensor measuring circuit as shown in Figure 7, circuit is repaid in the half-bridge complementation that metering circuit is made up of two ferrite cored coils that are installed in the sensor twin beams outside or inboard fixed end and twin beams ferromagnet, this circuit is by the copper loss resistance R
1, whirlpool power consumption resistance R
2With coil inductance L
2The outer half-bridge of forming is by two groups of preset resistance R in A, B, 3 of C and the strainmeter
3, R
4The interior half-bridge of forming connects and composes.
Preset balancing circuitry 2 is by resistance coarse adjustment R
20～R
29, inductance coarse adjustment L
2, resistance fine tuning W
3With inductance fine tuning W
2, to form, and be that the center is connected with bridge circuit power end A, C with the D point, when by adjusting sensor not being worked, the measurement bridge is in equilibrium state, and electric bridge is output as zero.
The method that the staircase waveform that standard sine wave producer 1 adopts the accurate D/A converter 0832 of single-chip microcomputer 89C51 control to produce approaches standard sine wave, provide the AC power of a high precision high stability, 0832 output is through one-level RC filtering, and one-level LC filtering and power amplification rearward measurement circuit provide 2KH
2, the power supply of 1V is held introducing from metering circuit A, C.
Amplifier circuit 4 is subjected to the sensitivity coefficient K switch by enlargement factor
3The positive inverting amplifier of being made up of two LF356 of control constitutes.Sending into amplifier after the harmonic components minimizing of output footpath LC wave filter with its non-linear generation of metering circuit amplifies.
The coherent detection circuit is made of the multi-way switch 4052 of single-chip microcomputer 89C51 control.Amplifying positive and negative two paths of signals that the back produces by amplifier sends into the coherent detector circuit simultaneously and finishes detection and separate with component.The pressure magnetic whirlpool consumption effect signal component that concentrates on real part is separated with the piezomagnetic effect component of signal that concentrates on imaginary part.For guaranteeing the electrical isolation of circuit, the control signal of 89C51 is not directly, but inserts the coherent detection circuit by the 7406 photoelectrical coupler 4N28 that drive.
A/D converter circuit 6 is made of 7135 double integration A/Ds.The DC voltage of any component after separating, selection that all can be by the switch on the panel is also sent into A/D converter and is carried out the A/D conversion, and the DC voltage of-2V+2V is become four half word results of-19999～+ 19999.
Output Display Unit circuit 7 by 7135,1413,4511 and the LED device constitute.It utilizes 7135 scan function, by 1413 and 4511 drivings, 6 LED charactrons is scanned, and shows that on panel four half words add the result data of a symbol.
In system when operation,, device such as the footnote of the control gauge length of various sensors, termination and footing screw and testee (concrete surface, inside or reinforcing bar) are closely linked.When structure produced stress under load action, the sensor gauge length will change and produce displacement, thereby drove double cantilever beam (containing curved beam), made its position that telefault is housed the opposite mechanically deform of equal and opposite in direction symbol (tension and compression) occur.This moment is in the magnetic loop of coil and ferromagnet formation, press magnetic whirlpool consumption effect and piezomagnetic effect to produce simultaneously, its signal is through measuring bridge circuit output, again after strainmeter separates, obtain the consumption effect signal component output of pure pressure magnetic whirlpool, thereby set up the linear relationship of tested displacement and strain-ga(u)ge measurement reading, must be reached the final purpose of structure detection by the strain and stress at each position of geodesic structure through demarcating and calculating again.
Claims (10)
1. press magnetic whirlpool consumption formula reinforced concrete strain sensor, it is characterized in that this strain transducer comprises ferromagnet (1), makes up ferromagnet footnote (4), pilot hole (5), clamping screw (6) and the outlet cable plug (7) that semi-girders (2), ferrite coil (3), taper hole and cone are connected with the whole processing of ferromagnet at two elasticity free ends of one, ferrite coil (3) is to use adhering with epoxy resin on ferromagnetic framework, and be positioned on the center line of semi-girder fixed end, the gap between holding coil iron core and the semi-girder surface is 0.1～0.15mm.
2. press magnetic whirlpool consumption formula reinforced concrete strain sensor according to claim 1, it is characterized in that two elasticity free end combination semi-girders (2) are that two one ends are fixed, an end has the free-ended combination semi-girder of semicircle, U-shaped or S shape elasticity.
3. press magnetic whirlpool consumption formula reinforced concrete strain sensor, it is characterized in that this strain transducer comprises ferromagnet (1), with the two elasticity free end combination cantilever curved beams (2) of the whole processing of ferromagnet in one, ferrite coil (3), termination (4), outlet cable plug (5), have ring poor aluminum alloy casing (6) and epoxy sealing (7), ferrite coil (3) is to be bonded on the ferromagnetic framework with epoxide-resin glue, and be positioned on the straight section center line of cantilever curved beam fixed end, gap between holding coil iron core and the curved beam surface is 0.1～0.15mm, and the aluminium that has an annular groove closes shell (6) and two elasticity free end combination cantilever curved beams (2) have constituted a kind of outer formula sensor construction that holds.
4. press magnetic whirlpool consumption formula reinforced concrete strain sensor, it is characterized in that this strain transducer comprises ferromagnet (1), with the two elasticity free end combination cantilever curved beams (2) of the whole processing of ferromagnet in one, ferrite coil (3), rubber seal (4), footing screw (5), aluminum alloy casing (6), silicone rubber seal separation layer (7), outlet cable plug (8) and end cap (9), ferrite coil (3) is to be bonded on the ferromagnetic framework with epoxide-resin glue, and be positioned on the straight section center line of cantilever curved beam fixed end, the gap between holding coil iron core and the curved beam surface is 0.1～0.15mm.
5. as pressure magnetic whirlpool consumption formula reinforced concrete strain sensor as described in claim 3 or 4, it is characterized in that two elasticity free ends combination cantilever curved beams (2) are that two one ends are fixed, an end has semicircle, U-shaped or the free-ended combination cantilever of S shape elasticity curved beam.
6. as the pressure magnetic strain instrument of pressure magnetic whirlpool consumption formula reinforced concrete strain sensor as described in one of claim 1～5, it is characterized in that this pressure magnetic strain instrument is connected and composed by standard sine wave producer (1), preset balancing circuitry (2), sensor measuring circuit (3), amplifier circuit (4), coherent detector circuit (5), A/D converter circuit (6) and Output Display Unit circuit (7) successively.
7. as the pressure magnetic strain instrument of pressure magnetic whirlpool consumption formula reinforced concrete strain sensor as described in the claim 6, it is characterized in that the half-bridge complementation that sensor measuring circuit (3) is made up of two ferrite cored coils that are installed in the sensor twin beams outside or inboard fixed end and twin beams ferromagnet repays circuit, this circuit is by the copper loss resistance R
1, whirlpool power consumption resistance R
2With coil inductance L
2The outer half-bridge of forming is by two groups of preset resistance R in A, B, 3 of C and the strainmeter
3, R
4The interior half-bridge of forming connects and composes.
8. as the pressure magnetic strain instrument of pressure magnetic whirlpool consumption formula reinforced concrete strain sensor as described in the claim 6, it is characterized in that preset balancing circuitry (2) is by resistance coarse adjustment R
20～R
29, inductance coarse adjustment L
2, resistance fine tuning w
3, inductance fine tuning w
2, to form, and be that the center is connected with bridge circuit power end A, C with the D point, when by adjusting sensor not being worked, the measurement bridge is in equilibrium state.
9. as the pressure magnetic strain instrument of pressure magnetic whirlpool consumption formula reinforced concrete strain sensor as described in the claim 6, it is characterized in that the method that standard sine wave producer (1) adopts the staircase waveform of accurate D/A converter 0832 generation of single-chip microcomputer 89C51 control to approach standard sine wave, provide the AC power of a high precision high stability, 0832 output is through one-level RC filtering, one-level LC filtering and power amplification rearward measurement circuit provide 2KHz, the power supply of 1V is held introducing from circuit A, C.
10. as the pressure magnetic strain instrument of pressure magnetic whirlpool consumption formula reinforced concrete strain sensor as described in the claim 6, it is characterized in that coherent detection circuit (5) is to be made of the multi-way switch 4052 that single-chip microcomputer 89C51 controls, amplify the positive and negative two paths of signals that the back produces by amplifier, sending into the coherent detector circuit simultaneously finishes detection and separates with component, the pressure magnetic whirlpool consumption effect signal component that concentrates on real part is separated with the piezomagnetic effect component of signal that concentrates on imaginary part, for guaranteeing the electrical isolation of circuit, the control signal of 89C51 is not directly, but inserts the coherent detection circuit by the 7406 photoelectrical coupler 4N28 that drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101515331A CN101806577B (en) | 2010-04-19 | 2010-04-19 | Piezomagnetic turbine loss type reinforced concrete strain sensor and piezomagnetic strain meter thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101515331A CN101806577B (en) | 2010-04-19 | 2010-04-19 | Piezomagnetic turbine loss type reinforced concrete strain sensor and piezomagnetic strain meter thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101806577A true CN101806577A (en) | 2010-08-18 |
| CN101806577B CN101806577B (en) | 2011-08-31 |
Family
ID=42608469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101515331A Expired - Fee Related CN101806577B (en) | 2010-04-19 | 2010-04-19 | Piezomagnetic turbine loss type reinforced concrete strain sensor and piezomagnetic strain meter thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101806577B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931364A (en) * | 2015-06-04 | 2015-09-23 | 浙江大学 | Reinforced concrete structure fatigue test method and device based on piezomagnetic effect |
| CN106482630A (en) * | 2016-12-26 | 2017-03-08 | 爱德森（厦门）电子有限公司 | A kind of utilization mutual inductor matrix measures the device and method of xoncrete structure deformation |
| CN107014326A (en) * | 2017-05-15 | 2017-08-04 | 基康仪器股份有限公司 | A kind of small-sized strain gauge of type vibration wire |
| CN107014325A (en) * | 2017-05-11 | 2017-08-04 | 中国科学院声学研究所 | A kind of wireless passive sonic surface wave strain transducer |
| CN109341511A (en) * | 2018-11-27 | 2019-02-15 | 曾剑煌 | A kind of reinforcing bar detection device by reversed air pressure feedback regulation |
| CN110411332A (en) * | 2019-09-03 | 2019-11-05 | 中国工程物理研究院化工材料研究所 | A kind of system and method for test resistance gauge factor |
| CN110799799A (en) * | 2017-06-02 | 2020-02-14 | 爱德拜克私人有限公司 | Displacement measuring device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043785A (en) * | 1988-12-27 | 1990-07-11 | 交通部重庆公路科学研究所 | A kind of piezomagnetic concrete absolute stress pick-up unit that can directly demonstrate stress value, |
| DE4205624A1 (en) * | 1992-02-25 | 1993-08-26 | Hottinger Messtechnik Baldwin | Deformation measuring device e.g. for testing concrete structure - has measurement spring of polymer concrete carrying measurement transducer, e.g. strain gauge, and with sealing coating |
| CN1351253A (en) * | 2001-12-12 | 2002-05-29 | 重庆大学 | Buried optical fibre strain sensor for concrete structure |
| CN2844874Y (en) * | 2005-08-17 | 2006-12-06 | 比亚迪股份有限公司 | Strain foil sensing probe for measuring internal stress distribution in solid material |
-
2010
- 2010-04-19 CN CN2010101515331A patent/CN101806577B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043785A (en) * | 1988-12-27 | 1990-07-11 | 交通部重庆公路科学研究所 | A kind of piezomagnetic concrete absolute stress pick-up unit that can directly demonstrate stress value, |
| DE4205624A1 (en) * | 1992-02-25 | 1993-08-26 | Hottinger Messtechnik Baldwin | Deformation measuring device e.g. for testing concrete structure - has measurement spring of polymer concrete carrying measurement transducer, e.g. strain gauge, and with sealing coating |
| CN1351253A (en) * | 2001-12-12 | 2002-05-29 | 重庆大学 | Buried optical fibre strain sensor for concrete structure |
| CN2844874Y (en) * | 2005-08-17 | 2006-12-06 | 比亚迪股份有限公司 | Strain foil sensing probe for measuring internal stress distribution in solid material |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931364A (en) * | 2015-06-04 | 2015-09-23 | 浙江大学 | Reinforced concrete structure fatigue test method and device based on piezomagnetic effect |
| CN106482630B (en) * | 2016-12-26 | 2019-02-26 | 爱德森（厦门）电子有限公司 | A kind of device and method using the measurement concrete structure deformation of mutual inductor matrix |
| CN106482630A (en) * | 2016-12-26 | 2017-03-08 | 爱德森（厦门）电子有限公司 | A kind of utilization mutual inductor matrix measures the device and method of xoncrete structure deformation |
| CN107014325B (en) * | 2017-05-11 | 2019-04-26 | 中国科学院声学研究所 | A kind of wireless passive sonic surface wave strain transducer |
| CN107014325A (en) * | 2017-05-11 | 2017-08-04 | 中国科学院声学研究所 | A kind of wireless passive sonic surface wave strain transducer |
| CN107014326A (en) * | 2017-05-15 | 2017-08-04 | 基康仪器股份有限公司 | A kind of small-sized strain gauge of type vibration wire |
| CN107014326B (en) * | 2017-05-15 | 2024-04-26 | 基康仪器股份有限公司 | Vibrating wire type small strain gauge |
| CN110799799A (en) * | 2017-06-02 | 2020-02-14 | 爱德拜克私人有限公司 | Displacement measuring device |
| CN110799799B (en) * | 2017-06-02 | 2022-04-29 | 爱德拜克私人有限公司 | Displacement measuring device |
| CN109341511A (en) * | 2018-11-27 | 2019-02-15 | 曾剑煌 | A kind of reinforcing bar detection device by reversed air pressure feedback regulation |
| CN109341511B (en) * | 2018-11-27 | 2020-08-28 | 广东建业检测技术有限公司 | Reinforcing steel bar detection device through reverse air pressure feedback adjustment |
| CN110411332A (en) * | 2019-09-03 | 2019-11-05 | 中国工程物理研究院化工材料研究所 | A kind of system and method for test resistance gauge factor |
| CN110411332B (en) * | 2019-09-03 | 2024-05-14 | 中国工程物理研究院化工材料研究所 | System and method for testing sensitivity coefficient of resistance strain gauge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101806577B (en) | 2011-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101806577B (en) | Piezomagnetic turbine loss type reinforced concrete strain sensor and piezomagnetic strain meter thereof | |
| CN104132767B (en) | A kind of pressure transmitter based on MEMS | |
| CN103245928B (en) | The method in the uniform magnetic field that direction is adjustable and even First-order Gradient magnetic field and device | |
| US20130049750A1 (en) | Giant Magnetoresistance Current Sensor | |
| CN101936791A (en) | Digital pressure gauge | |
| CN202903128U (en) | Strain measuring device for concrete structural body | |
| CN105547126A (en) | Eddy current displacement sensor | |
| CN206248252U (en) | A kind of anchor pole axial direction dynamometer | |
| CN104006909B (en) | The cable tension sensor of a kind of Suo Li detection method and use the method | |
| CN205404673U (en) | Electrified measuring device of portable line current | |
| CN102322897A (en) | Intelligent slurry density and liquid level integrative analysis instrument and analysis method | |
| CN101609108B (en) | Method for measuring voltage or current signal and sensor for realizing method | |
| CN102914265A (en) | Optical fiber strain gauge and high-sensitivity disc-type displacement sensor with ultra-short base line | |
| CN107340041A (en) | Resistance-strain type vehicle weighing sensor | |
| CN102393540B (en) | Magnetic suspension rainfall intensity recorder | |
| CN103162877A (en) | Method of testing bolt load | |
| CN108152556B (en) | Passive excitation self-powered wireless non-contact current sensing measurement device and measurement method | |
| CN110346838A (en) | A kind of PCCP pipe fracture of wire detection device based on orthogonal electromagnetic principle | |
| CN204495494U (en) | With the iron gallium alloy force snesor of precompressed mechanism | |
| CN205861609U (en) | A kind of electromagnetic transducer system of novel detection defect in rope | |
| CN204831654U (en) | Dolphin force detection device | |
| CN209656089U (en) | A kind of oil pipeline stress mornitoring experimental rig based on magnetic coupling effect | |
| CN201344949Y (en) | Portable feedthrough small current sensor with 750kV transformer field idling characteristic | |
| CN102322792B (en) | Concrete pole rebar quality tester and detection method by using tester | |
| CN109238517A (en) | A kind of detection device and detection method of anchor axial force |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20170419 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |